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<a name="1" href="#1">1</a>   <strong class="jxr_keyword">package</strong> com.totsp.gwittir.client.fx;
<a name="2" href="#2">2</a>   
<a name="3" href="#3">3</a>   <strong class="jxr_keyword">import</strong> com.google.gwt.user.client.DOM;
<a name="4" href="#4">4</a>   <strong class="jxr_keyword">import</strong> com.google.gwt.user.client.Element;
<a name="5" href="#5">5</a>   <strong class="jxr_keyword">import</strong> com.google.gwt.user.client.Event;
<a name="6" href="#6">6</a>   <strong class="jxr_keyword">import</strong> com.google.gwt.user.client.EventPreview;
<a name="7" href="#7">7</a>   <strong class="jxr_keyword">import</strong> com.google.gwt.user.client.ui.MouseListenerAdapter;
<a name="8" href="#8">8</a>   <strong class="jxr_keyword">import</strong> com.google.gwt.user.client.ui.SourcesMouseEvents;
<a name="9" href="#9">9</a>   <strong class="jxr_keyword">import</strong> com.google.gwt.user.client.ui.Widget;
<a name="10" href="#10">10</a>  <strong class="jxr_keyword">import</strong> com.totsp.gwittir.client.log.Level;
<a name="11" href="#11">11</a>  <strong class="jxr_keyword">import</strong> com.totsp.gwittir.client.log.Logger;
<a name="12" href="#12">12</a>  
<a name="13" href="#13">13</a>  <strong class="jxr_keyword">import</strong> java.util.ArrayList;
<a name="14" href="#14">14</a>  <strong class="jxr_keyword">import</strong> java.util.HashMap;
<a name="15" href="#15">15</a>  <strong class="jxr_keyword">import</strong> java.util.List;
<a name="16" href="#16">16</a>  
<a name="17" href="#17">17</a>  
<a name="18" href="#18">18</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../com/totsp/gwittir/client/fx/DragAndDrop.html">DragAndDrop</a> {
<a name="19" href="#19">19</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../../com/totsp/gwittir/client/fx/DragAndDrop.html">DragAndDrop</a> instance = <strong class="jxr_keyword">new</strong> <a href="../../../../../com/totsp/gwittir/client/fx/DragAndDrop.html">DragAndDrop</a>();
<a name="20" href="#20">20</a>      <strong class="jxr_keyword">private</strong> <a href="../../../../../com/totsp/gwittir/client/fx/DragAndDrop.html">Draggable</a> dragging;
<a name="21" href="#21">21</a>      <strong class="jxr_keyword">private</strong> Element placeholder;
<a name="22" href="#22">22</a>      <strong class="jxr_keyword">private</strong> HashMap draggables = <strong class="jxr_keyword">new</strong> HashMap();
<a name="23" href="#23">23</a>      <strong class="jxr_keyword">private</strong> HashMap dropListeners = <strong class="jxr_keyword">new</strong> HashMap();
<a name="24" href="#24">24</a>      <strong class="jxr_keyword">private</strong> List dropTargets;
<a name="25" href="#25">25</a>  
<a name="26" href="#26">26</a>      <strong class="jxr_keyword">private</strong> <a href="../../../../../com/totsp/gwittir/client/fx/DragAndDrop.html">DragAndDrop</a>() {
<a name="27" href="#27">27</a>      }
<a name="28" href="#28">28</a>  
<a name="29" href="#29">29</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> addDropListener(Widget w, <a href="../../../../../com/totsp/gwittir/client/fx/DropListener.html">DropListener</a> dl) {
<a name="30" href="#30">30</a>          List listeners = (dropListeners.get(w) != <strong class="jxr_keyword">null</strong>)
<a name="31" href="#31">31</a>              ? (List) dropListeners.get(w) : <strong class="jxr_keyword">new</strong> ArrayList();
<a name="32" href="#32">32</a>          listeners.add(dl);
<a name="33" href="#33">33</a>          dropListeners.put(w, listeners);
<a name="34" href="#34">34</a>      }
<a name="35" href="#35">35</a>  
<a name="36" href="#36">36</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <a href="../../../../../com/totsp/gwittir/client/fx/DragAndDrop.html">DragAndDrop</a> getInstance() {
<a name="37" href="#37">37</a>          <strong class="jxr_keyword">return</strong> instance;
<a name="38" href="#38">38</a>      }
<a name="39" href="#39">39</a>  
<a name="40" href="#40">40</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> makeDraggable(SourcesMouseEvents w, <strong class="jxr_keyword">boolean</strong> revert) {
<a name="41" href="#41">41</a>          <a href="../../../../../com/totsp/gwittir/client/fx/DragAndDrop.html">Draggable</a> d = <strong class="jxr_keyword">new</strong> <a href="../../../../../com/totsp/gwittir/client/fx/DragAndDrop.html">Draggable</a>();
<a name="42" href="#42">42</a>          d.widget = (Widget) w;
<a name="43" href="#43">43</a>          d.listener = <strong class="jxr_keyword">new</strong> <a href="../../../../../com/totsp/gwittir/client/fx/DragAndDrop.html">DragSupportListener</a>((Widget) w, revert);
<a name="44" href="#44">44</a>          w.addMouseListener(d.listener);
<a name="45" href="#45">45</a>          draggables.put(w, d);
<a name="46" href="#46">46</a>      }
<a name="47" href="#47">47</a>  
<a name="48" href="#48">48</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> makeDroppable(Widget w) {
<a name="49" href="#49">49</a>          dropTargets = (dropTargets == <strong class="jxr_keyword">null</strong>) ? <strong class="jxr_keyword">new</strong> ArrayList() : dropTargets;
<a name="50" href="#50">50</a>          dropTargets.add(w);
<a name="51" href="#51">51</a>      }
<a name="52" href="#52">52</a>  
<a name="53" href="#53">53</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> removeDropListeners(SourcesMouseEvents w, <a href="../../../../../com/totsp/gwittir/client/fx/DropListener.html">DropListener</a> dl) {
<a name="54" href="#54">54</a>          List listeners = (dropListeners.get(w) != <strong class="jxr_keyword">null</strong>)
<a name="55" href="#55">55</a>              ? (List) dropListeners.get(w) : <strong class="jxr_keyword">new</strong> ArrayList();
<a name="56" href="#56">56</a>          listeners.remove(dl);
<a name="57" href="#57">57</a>      }
<a name="58" href="#58">58</a>  
<a name="59" href="#59">59</a>      <strong class="jxr_keyword">class</strong> <a href="../../../../../com/totsp/gwittir/client/fx/DragAndDrop.html">DragSupportListener</a> <strong class="jxr_keyword">extends</strong> MouseListenerAdapter {
<a name="60" href="#60">60</a>          <strong class="jxr_keyword">private</strong> String startFlow;
<a name="61" href="#61">61</a>          <strong class="jxr_keyword">private</strong> String startZ;
<a name="62" href="#62">62</a>          <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong> revert;
<a name="63" href="#63">63</a>          <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> offsetX;
<a name="64" href="#64">64</a>          <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> offsetY;
<a name="65" href="#65">65</a>          <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> startX;
<a name="66" href="#66">66</a>          <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> startY;
<a name="67" href="#67">67</a>  
<a name="68" href="#68">68</a>          <strong class="jxr_keyword">public</strong> <a href="../../../../../com/totsp/gwittir/client/fx/DragAndDrop.html">DragSupportListener</a>(Widget w, <strong class="jxr_keyword">boolean</strong> revert) {
<a name="69" href="#69">69</a>              <strong class="jxr_keyword">this</strong>.revert = revert;
<a name="70" href="#70">70</a>              DOM.addEventPreview(<strong class="jxr_keyword">new</strong> EventPreview() {
<a name="71" href="#71">71</a>                      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> onEventPreview(Event event) {
<a name="72" href="#72">72</a>                          <strong class="jxr_keyword">switch</strong>(DOM.eventGetType(event)) {
<a name="73" href="#73">73</a>                          <strong class="jxr_keyword">case</strong> Event.ONMOUSEDOWN:
<a name="74" href="#74">74</a>                              DOM.eventPreventDefault(event);
<a name="75" href="#75">75</a>                          }
<a name="76" href="#76">76</a>  
<a name="77" href="#77">77</a>                          <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a name="78" href="#78">78</a>                      }
<a name="79" href="#79">79</a>                  });
<a name="80" href="#80">80</a>          }
<a name="81" href="#81">81</a>  
<a name="82" href="#82">82</a>          <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> onMouseDown(Widget sender, <strong class="jxr_keyword">int</strong> x, <strong class="jxr_keyword">int</strong> y) {
<a name="83" href="#83">83</a>              <strong class="jxr_keyword">super</strong>.onMouseDown(sender, x, y);
<a name="84" href="#84">84</a>  
<a name="85" href="#85">85</a>              <strong class="jxr_keyword">if</strong>(dragging != <strong class="jxr_keyword">null</strong>) {
<a name="86" href="#86">86</a>                  dragging.listener.onMouseUp(dragging.widget, 0, 0);
<a name="87" href="#87">87</a>              }
<a name="88" href="#88">88</a>  
<a name="89" href="#89">89</a>              dragging = (Draggable) draggables.get(sender);
<a name="90" href="#90">90</a>              startFlow = DOM.getStyleAttribute(dragging.widget.getElement(),
<a name="91" href="#91">91</a>                      <span class="jxr_string">"position"</span>);
<a name="92" href="#92">92</a>              startX = dragging.widget.getAbsoluteLeft();
<a name="93" href="#93">93</a>              startY = dragging.widget.getAbsoluteTop();
<a name="94" href="#94">94</a>              offsetX = x;
<a name="95" href="#95">95</a>              offsetY = y;
<a name="96" href="#96">96</a>              Logger.getAnonymousLogger().log( Level.SPAM,<span class="jxr_string">"Start X = "</span> + startX, <strong class="jxr_keyword">null</strong>);
<a name="97" href="#97">97</a>              Logger.getAnonymousLogger().log( Level.SPAM,<span class="jxr_string">"Start Y = "</span> + startY, <strong class="jxr_keyword">null</strong>);
<a name="98" href="#98">98</a>              Logger.getAnonymousLogger().log( Level.SPAM,<span class="jxr_string">"X = "</span> + x, <strong class="jxr_keyword">null</strong>);
<a name="99" href="#99">99</a>              Logger.getAnonymousLogger().log( Level.SPAM,<span class="jxr_string">"Y = "</span> + y, <strong class="jxr_keyword">null</strong>);
<a name="100" href="#100">100</a>             Logger.getAnonymousLogger().log( Level.SPAM,<span class="jxr_string">"OffsetX = "</span> + offsetX, <strong class="jxr_keyword">null</strong>);
<a name="101" href="#101">101</a>             Logger.getAnonymousLogger().log( Level.SPAM,<span class="jxr_string">"Offset Y = "</span> + offsetY, <strong class="jxr_keyword">null</strong>);
<a name="102" href="#102">102</a>             startZ = DOM.getStyleAttribute(dragging.widget.getElement(),
<a name="103" href="#103">103</a>                     <span class="jxr_string">"z-index"</span>);
<a name="104" href="#104">104</a>             DOM.setStyleAttribute(dragging.widget.getElement(), <span class="jxr_string">"position"</span>,
<a name="105" href="#105">105</a>                 <span class="jxr_string">"absolute"</span>);
<a name="106" href="#106">106</a>             DOM.setStyleAttribute(dragging.widget.getElement(), <span class="jxr_string">"top"</span>,
<a name="107" href="#107">107</a>                 <span class="jxr_string">""</span> + startY);
<a name="108" href="#108">108</a>             DOM.setStyleAttribute(dragging.widget.getElement(), <span class="jxr_string">"left"</span>,
<a name="109" href="#109">109</a>                 <span class="jxr_string">""</span> + startX);
<a name="110" href="#110">110</a>             DOM.setStyleAttribute(dragging.widget.getElement(), <span class="jxr_string">"z-index"</span>,
<a name="111" href="#111">111</a>                 <span class="jxr_string">""</span> + 10000);
<a name="112" href="#112">112</a>             placeholder = DOM.createDiv();
<a name="113" href="#113">113</a>             DOM.setStyleAttribute(placeholder, <span class="jxr_string">"width"</span>,
<a name="114" href="#114">114</a>                 dragging.widget.getOffsetWidth() + <span class="jxr_string">"px"</span>);
<a name="115" href="#115">115</a>             DOM.setStyleAttribute(placeholder, <span class="jxr_string">"height"</span>,
<a name="116" href="#116">116</a>                 dragging.widget.getOffsetHeight() + <span class="jxr_string">"px"</span>);
<a name="117" href="#117">117</a>             DOM.setStyleAttribute(placeholder, <span class="jxr_string">"background"</span>, <span class="jxr_string">"#CCCCCC"</span>);
<a name="118" href="#118">118</a> 
<a name="119" href="#119">119</a>             <strong class="jxr_keyword">int</strong> index = DOM.getChildIndex(DOM.getParent(
<a name="120" href="#120">120</a>                         dragging.widget.getElement()),
<a name="121" href="#121">121</a>                     dragging.widget.getElement());
<a name="122" href="#122">122</a>             DOM.insertChild(DOM.getParent(dragging.widget.getElement()),
<a name="123" href="#123">123</a>                 placeholder, index);
<a name="124" href="#124">124</a>         }
<a name="125" href="#125">125</a> 
<a name="126" href="#126">126</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> onMouseMove(Widget sender, <strong class="jxr_keyword">int</strong> x, <strong class="jxr_keyword">int</strong> y) {
<a name="127" href="#127">127</a>             <strong class="jxr_keyword">super</strong>.onMouseMove(sender, x, y);
<a name="128" href="#128">128</a> 
<a name="129" href="#129">129</a>             <strong class="jxr_keyword">if</strong>(dragging != <strong class="jxr_keyword">null</strong>) {
<a name="130" href="#130">130</a>                 Logger.getAnonymousLogger().log( Level.SPAM,<span class="jxr_string">"Drag X:"</span> + x + <span class="jxr_string">" Y:"</span> + y, <strong class="jxr_keyword">null</strong>);
<a name="131" href="#131">131</a>                 Logger.getAnonymousLogger().log( Level.SPAM,<span class="jxr_string">"Offset X:"</span> + offsetX + <span class="jxr_string">" Y:"</span> + offsetY, <strong class="jxr_keyword">null</strong>);
<a name="132" href="#132">132</a>                 DOM.setStyleAttribute(dragging.widget.getElement(), <span class="jxr_string">"top"</span>,
<a name="133" href="#133">133</a>                     Integer.toString(sender.getAbsoluteTop() - offsetY + y));
<a name="134" href="#134">134</a>                 DOM.setStyleAttribute(dragging.widget.getElement(), <span class="jxr_string">"left"</span>,
<a name="135" href="#135">135</a>                     Integer.toString(sender.getAbsoluteLeft() - offsetX + x));
<a name="136" href="#136">136</a>             }
<a name="137" href="#137">137</a>         }
<a name="138" href="#138">138</a> 
<a name="139" href="#139">139</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> onMouseUp(Widget sender, <strong class="jxr_keyword">int</strong> x, <strong class="jxr_keyword">int</strong> y) {
<a name="140" href="#140">140</a>             <strong class="jxr_keyword">super</strong>.onMouseUp(sender, x, y);
<a name="141" href="#141">141</a>             Logger.getAnonymousLogger().log( Level.SPAM,<span class="jxr_string">"Up"</span>, <strong class="jxr_keyword">null</strong>);
<a name="142" href="#142">142</a>             DOM.setStyleAttribute(dragging.widget.getElement(), <span class="jxr_string">"z-index"</span>,
<a name="143" href="#143">143</a>                 startZ);
<a name="144" href="#144">144</a> 
<a name="145" href="#145">145</a>             Logger.getAnonymousLogger().log( Level.SPAM,<span class="jxr_string">"Looking for Drop"</span>, <strong class="jxr_keyword">null</strong>);
<a name="146" href="#146">146</a> 
<a name="147" href="#147">147</a>             <strong class="jxr_keyword">int</strong> top = dragging.widget.getAbsoluteTop();
<a name="148" href="#148">148</a>             <strong class="jxr_keyword">int</strong> left = dragging.widget.getAbsoluteLeft();
<a name="149" href="#149">149</a>             Logger.getAnonymousLogger().log( Level.SPAM,<span class="jxr_string">"Top:"</span> + top + <span class="jxr_string">" Left:"</span> + left + <span class="jxr_string">"OffsetTop"</span> +
<a name="150" href="#150">150</a>                 dragging.widget.getOffsetHeight() + <span class="jxr_string">" OffsetLeft:"</span> +
<a name="151" href="#151">151</a>                 dragging.widget.getOffsetWidth(), <strong class="jxr_keyword">null</strong>);
<a name="152" href="#152">152</a> 
<a name="153" href="#153">153</a>             <strong class="jxr_keyword">int</strong> centerY = top +
<a name="154" href="#154">154</a>                 (<strong class="jxr_keyword">int</strong>) ((<strong class="jxr_keyword">float</strong>) dragging.widget.getOffsetHeight() / (<strong class="jxr_keyword">float</strong>) 2);
<a name="155" href="#155">155</a>             <strong class="jxr_keyword">int</strong> centerX = left +
<a name="156" href="#156">156</a>                 (<strong class="jxr_keyword">int</strong>) ((<strong class="jxr_keyword">float</strong>) dragging.widget.getOffsetWidth() / (<strong class="jxr_keyword">float</strong>) 2);
<a name="157" href="#157">157</a>             Logger.getAnonymousLogger().log( Level.SPAM,<span class="jxr_string">"Center Top:"</span> + centerY + <span class="jxr_string">" Center Left:"</span> + centerX, <strong class="jxr_keyword">null</strong>);
<a name="158" href="#158">158</a> 
<a name="159" href="#159">159</a>             <strong class="jxr_keyword">for</strong>(<strong class="jxr_keyword">int</strong> i = 0; (dropTargets != <strong class="jxr_keyword">null</strong>) &amp;&amp; (i &lt; dropTargets.size());
<a name="160" href="#160">160</a>                     i++) {
<a name="161" href="#161">161</a>                 Widget w = (Widget) dropTargets.get(i);
<a name="162" href="#162">162</a>                 Logger.getAnonymousLogger().log( Level.SPAM,<span class="jxr_string">"Top Range: "</span> + w.getAbsoluteTop() + <span class="jxr_string">" .. "</span> +
<a name="163" href="#163">163</a>                     (w.getAbsoluteTop() + w.getOffsetHeight()), <strong class="jxr_keyword">null</strong>);
<a name="164" href="#164">164</a>                 Logger.getAnonymousLogger().log( Level.SPAM,<span class="jxr_string">"Left Range: "</span> + w.getAbsoluteLeft() + <span class="jxr_string">" .. "</span> +
<a name="165" href="#165">165</a>                     (w.getAbsoluteLeft() + w.getOffsetWidth()), <strong class="jxr_keyword">null</strong>);
<a name="166" href="#166">166</a> 
<a name="167" href="#167">167</a>                 <strong class="jxr_keyword">if</strong>((centerY &gt;= w.getAbsoluteTop()) &amp;&amp;
<a name="168" href="#168">168</a>                         (centerY &lt;= (w.getAbsoluteTop() + w.getOffsetHeight())) &amp;&amp;
<a name="169" href="#169">169</a>                         (centerX &gt;= w.getAbsoluteLeft()) &amp;&amp;
<a name="170" href="#170">170</a>                         (centerX &lt;= (w.getAbsoluteLeft() + w.getOffsetWidth()))) {
<a name="171" href="#171">171</a>                     List listeners = (List) dropListeners.get(w);
<a name="172" href="#172">172</a> 
<a name="173" href="#173">173</a>                     <strong class="jxr_keyword">for</strong>(<strong class="jxr_keyword">int</strong> j = 0;
<a name="174" href="#174">174</a>                             (listeners != <strong class="jxr_keyword">null</strong>) &amp;&amp; (j &lt; listeners.size());
<a name="175" href="#175">175</a>                             j++) {
<a name="176" href="#176">176</a>                         <a href="../../../../../com/totsp/gwittir/client/fx/DropListener.html">DropListener</a> l = (DropListener) listeners.get(j);
<a name="177" href="#177">177</a> 
<a name="178" href="#178">178</a>                         <strong class="jxr_keyword">if</strong>(l.onDrop(dragging.widget)) {
<a name="179" href="#179">179</a>                             <strong class="jxr_keyword">break</strong>;
<a name="180" href="#180">180</a>                         }
<a name="181" href="#181">181</a>                     }
<a name="182" href="#182">182</a>                 }
<a name="183" href="#183">183</a>             }
<a name="184" href="#184">184</a> 
<a name="185" href="#185">185</a>             <strong class="jxr_keyword">if</strong>(revert) {
<a name="186" href="#186">186</a>                 DOM.setStyleAttribute(dragging.widget.getElement(), <span class="jxr_string">"position"</span>,
<a name="187" href="#187">187</a>                     startFlow);
<a name="188" href="#188">188</a>                 DOM.setStyleAttribute(dragging.widget.getElement(), <span class="jxr_string">"top"</span>,
<a name="189" href="#189">189</a>                     <span class="jxr_string">""</span> + startY);
<a name="190" href="#190">190</a>                 DOM.setStyleAttribute(dragging.widget.getElement(), <span class="jxr_string">"left"</span>,
<a name="191" href="#191">191</a>                     <span class="jxr_string">""</span> + startX);
<a name="192" href="#192">192</a>                 DOM.removeChild(DOM.getParent(dragging.widget.getElement()),
<a name="193" href="#193">193</a>                     placeholder);
<a name="194" href="#194">194</a>                 placeholder = <strong class="jxr_keyword">null</strong>;
<a name="195" href="#195">195</a>             }
<a name="196" href="#196">196</a> 
<a name="197" href="#197">197</a>             dragging = <strong class="jxr_keyword">null</strong>;
<a name="198" href="#198">198</a>         }
<a name="199" href="#199">199</a>     }
<a name="200" href="#200">200</a> 
<a name="201" href="#201">201</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../com/totsp/gwittir/client/fx/DragAndDrop.html">Draggable</a> {
<a name="202" href="#202">202</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../../com/totsp/gwittir/client/fx/DragAndDrop.html">DragSupportListener</a> listener;
<a name="203" href="#203">203</a>         <strong class="jxr_keyword">public</strong> Widget widget;
<a name="204" href="#204">204</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">int</strong> upperX;
<a name="205" href="#205">205</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">int</strong> upperY;
<a name="206" href="#206">206</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">int</strong> lowerX;
<a name="207" href="#207">207</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">int</strong> lowerY;
<a name="208" href="#208">208</a>     }
<a name="209" href="#209">209</a> }
</pre>
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